Get access

Predicting single and mixture toxicity of petrogenic polycyclic aromatic hydrocarbons to the copepod Oithona davisae

Authors

  • Carlos Barata,

    Corresponding author
    1. Laboratory of Environmental Toxicology, Universitat Politécnica de Catalunya, CN 150 Km 14.5, Terrassa 08220, Spain
    • Laboratory of Environmental Toxicology, Universitat Politécnica de Catalunya, CN 150 Km 14.5, Terrassa 08220, Spain
    Search for more papers by this author
  • Albert Calbet,

    1. Institut de Ciències del Mar-CMIMA, Consejo Superior de Investigaciones Científicas. P. Marítim de la Barceloneta 37–49, Barcelona 08003, Spain
    Search for more papers by this author
  • Enric Saiz,

    1. Institut de Ciències del Mar-CMIMA, Consejo Superior de Investigaciones Científicas. P. Marítim de la Barceloneta 37–49, Barcelona 08003, Spain
    Search for more papers by this author
  • Laura Ortiz,

    1. Department of Environmental Chemistry, Institut d'Investigacions Químiques i Ambientals de Barcelona, Consejo Superior de Investigaciones Científicas, Jordi Girona 18, Barcelona 08034, Spain
    Search for more papers by this author
  • Josep Maria Bayona

    1. Department of Environmental Chemistry, Institut d'Investigacions Químiques i Ambientals de Barcelona, Consejo Superior de Investigaciones Científicas, Jordi Girona 18, Barcelona 08034, Spain
    Search for more papers by this author

Abstract

In the present study, the acute toxicity of 10 polycyclic aromatic hydrocarbons (PAH) associated with the Prestige fuel oil spill (Spain, 2002) were evaluated, either as single substances or in mixtures, in adults of the copepod Oithona davisae. All but dimethylphenanthrene had negative effects on O. davisae survival at concentrations below their water solubility, with 48-h median lethal concentrations for naphthalene and pyrene of 56.1 and 0.8 μmol/L, respectively, making these the least and most toxic compounds. Polycyclic aromatic hydrocarbons had narcotic effects on copepods, as evidenced by the lack of motility at lower concentrations than those causing death. Naphthalene showed the greatest narcotic effects, and phenanthrene showed minor effects. Acute toxicity of the tested PAHs was inversely related (r2 = 0.9) with their octanol—water partition coefficient, thereby confirming the validity of the baseline quantitative structure—activity regression models for predicting the toxicity of PAH compounds in copepod species. When supplied in mixtures, the toxic effect of PAHs was additive. These results indicate that the many PAHs in an oil spill can be considered unambiguous baseline toxicants (class 1) acting additively as nonpolar narcotics in copepods; hence, their individual and combined toxicity can be predicted using their octanol—water partition coefficient.

Get access to the full text of this article

Ancillary